pc87311a National Semiconductor Corporation, pc87311a Datasheet

pc87311a

Manufacturer Part Number

pc87311a

Description

Pc87311a/pc87312 Superi/otm Ii/iii Floppy Disk Controller With Dual Uarts, Parallel Port, And Ide Interface

Manufacturer

National Semiconductor Corporation

Datasheet

1.PC87311A.pdf (78 pages)

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C 1995 National Semiconductor Corporation

PC87311A PC87312 (SuperI O

Floppy Disk Controller with Dual UARTs

Parallel Port and IDE Interface

General Description

The PC87311A 12 incorporates a floppy disk controller

(FDC) two full function UARTs a bidirectional parallel port

and IDE interface control logic in one chip The PC87311A

includes standard AT XT address decoding for on-chip

functions and a Configuration Register offering a single

chip solution to the most commonly used IBM

PC-XT

standard AT address decoding for on-chip functions and a

Configuration Register set offering a single chip solution to

the most commonly used ISA EISA and Micro Channel pe-

ripherals

The on-chip FDC is software compatible to the PC8477

which contains a superset of the DP8473 and NEC mPD765

and the N82077 floppy disk controller functions The on-

chip analog data separator requires no external compo-

nents and supports the 4 Mb drive format as well as the

other standard floppy drives used with 5 25 and 3 5 me-

dia

In the PC87311A the UARTs are equivalent to two

INS8250N-Bs or NS16450s The bidirectional parallel port

maintains complete compatibility with the IBM PC XT and

AT In the PC87312 the UARTs are equivalent to two

NS16450s or PC16550s The bidirectional parallel port

maintains complete compatibility with the ISA EISA and Mi-

cro Channel parallel ports

The IDE control logic provides a complete IDE interface ex-

cept for the signal buffers The Configuration Registers con-

sist of three byte-wide registers An Index and a Data Regis-

ter which can be relocated within the ISA I O address space

access the Configuration Registers

Block Diagram

TRI-STATE is a registered trademark of National Semiconductor Corporation

SuperI O

IBM

is a trademark of National Semiconductor Corporation

PC-AT

and PC-AT

PC-XT and PS 2 are registered trademarks of International Business Machines Corporation

peripherals The PC87312 includes

TL F 11362

Features

100% compatible with IBM PC XT and AT architec-

tures (PC87311A) or ISA EISA and Micro Channel ar-

chitectures (PC87312)

FDC

UARTs

Parallel Port

IDE Control Logic

Address Decoder

100-pin PQFP package

Software compatible with the DP8473 the 765A and

the N82077

16-byte FIFO (default disabled)

Burst and Non-Burst modes

Perpendicular Recording drive support

High performance internal analog data separator (no

external filter components required)

Low power CMOS with power down mode

Software compatible with the INS8250N-B and the

NS16450 (PC87311A) or PC16550A and PC16450

(PC87312)

Bidirectional under either software or hardware

control

Compatible with all IBM PC XT and AT architectures

(PC87311A) or all ISA EISA and Micro Channel ar-

chitectures (PC87312)

Back Voltage protection circuit against damage

caused when printer is powered up

Provides a complete IDE interface except for option-

al buffers

Provides selection of all primary and secondary ISA

addresses including COM 1 – 4

The PC87311A and PC87312 are pin compatible

II III)

RRD-B30M75 Printed in U S A

October 1993

TL F 11362 – 1

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